sg4::CommPtr comm = mailbox->get_init()->set_dst_data((void**)&received, sizeof(double));
comm->set_name("comm from sender")->add_successor(exec)->start();
sg4::CommPtr comm = mailbox->get_init()->set_dst_data((void**)&received, sizeof(double));
comm->set_name("comm from sender")->add_successor(exec)->start();